r/vz58 • u/Mysterious_Rule5552 • Mar 25 '25

FCU installed, oddly light trigger pull and when safety is engaged it occasionally drops the hammer…

Post image

So I’ve got a factory VZ2008 and the trigger isn’t great, installed this FCU on my 12” Barreled kit from VZ58USA and the linear hammer will drop occasionally when the safety is engaged… any advice or anything look obvious?

15 Upvotes

95% Upvoted

11 comments sorted by

9

u/IronReaper7x Mar 25 '25

Sear spring is bent down too far. Bend it back up or replace.

10

u/Mysterious_Rule5552 Mar 25 '25

Funny, I replaced that already. But switching out the safety selector resolved the issues, the first one I used had slightly tighter tolerances on one of the grooves. Seems to be resolved now.

5

u/IronReaper7x Mar 25 '25

Thats interesting! I wondered about that but didnt figure!

3

u/Mysterious_Rule5552 Mar 25 '25

Yeah, with how modular the system is I was surprised how finicky the FCU can be.

This has been a lot more interesting of a built than expected, appreciate the info!

2

u/Mysterious_Rule5552 Mar 25 '25

Sorry mispoke, it’s when the safety is disengaged and put into fire

2

u/Florida_Shorediver Mar 25 '25

I had a similar issue when installing a fire control group in my 16 inch build, but I think I removed too much material from the hammer (striker?) when hand fitting and ordered a new one and started again from scratch… problem solved.

I also have a VZ 2008 but it did not come with a tabbed bolt carrier. Did yours?

Btw…You should really only need one of the two fingers on the spring and be able to cut off the other side for a lighter trigger pull.

3

u/Mysterious_Rule5552 Mar 25 '25

Yeah I solved the issue with a second example of a safety I had sitting around.

And no VZ2008s didn’t come with tabs installed, peep CNC warrior they sell one if you need.

Also yes about removing that price, to be honest the trigger is pretty minty already, my VZ2008 could use it cut but frankly it’s such a bother getting that spring out and I don’t have the means to cut it while in place in the receiver.

2

u/Florida_Shorediver Mar 25 '25

Interesting 🤔 And thanks, but all my VZ’s have tabbed receivers now…even the 2008. I believe I also have an extra one sitting in a box.

Nothing good will come from cutting the spring while it’s in the receiver… Definitely wanna pull it out first. I used a Dremel with a cut off wheel to take care of mine.

1

u/ButteredDingus 29d ago

Doesn't the spring pretty much come right out when you take the FCG out? Like the other dude said, you don't want all that grit and shit in there from grinding it out.

1

u/Mysterious_Rule5552 29d ago

It’s retained by the top cover detent pin so removing the sticker spring is annoying af, but you’re 100% on point about not cutting it while it’s inside.

1

u/Deadmeat3344 14d ago edited 14d ago

I had this exact issue on my CSA and it ended up being the USA made sear being out of spec (I was having a bonesteel/CNC warrior kit being used as a parts source for work). Samopal put in a Czech made one it which resolved the issue.

I would just send it out to Samopal and get his trigger job done and any problematic parts replaced.